Xbox One Controller Rechargeable Battery Pack w/ USB Charging Cable, Play While You Charge Power Kit Works with Xbox One wireless controllers Play 6 hrs on one charge Replaces AA Batteries Charges while you play and while Xbox is in standby mode Includes 1 battery pack (1200mAh NiMH) and 1 micro-USB charging cable. Must charge battery for 8 hours prior to first use. Optimal battery life will be achieved after 2-3 rounds of charging.